07-08-2012, 11:36 AM
Stellaris LM3S6965 Evaluation Board
[attachment=30324]
The Stellaris® LM3S6965 Evaluation Board is a compact and versatile evaluation platform for the
Stellaris LM3S6965 ARM® Cortex™-M3-based microcontroller. The evaluation kit uses the
LM3S6965 microcontroller’s fully integrated 10/100 Ethernet controller to demonstrate an
embedded web server.
You can use the board either as an evaluation platform or as a low-cost in-circuit debug interface
(ICDI). In debug interface mode, the on-board microcontroller is bypassed, allowing programming
or debugging of an external target. The kit is also compatible with high-performance external JTAG
debuggers.
This evaluation kit enables quick evaluation, prototype development, and creation of applicationspecific
designs for Ethernet networks. The kit also includes extensive source-code examples,
allowing you to start building C code applications quickly.
Hardware Description
In addition to a microcontroller, the Stellaris LM3S6965 evaluation board includes a range of useful
peripherals and an integrated ICDI. This chapter describes how these peripherals operate and
interface to the MCU.
LM3S6965 Microcontroller
Device Overview
The heart of the EVB is a Stellaris LM3S6965 ARM Cortex-M3-based microcontroller. The
LM3S6965 offers 256 KB Flash memory, 50-MHz operation, an Ethernet controller, and a wide
range of peripherals. Refer to the LM3S6965 data sheet (order number DS-LM3S6965) for
complete device details.
The LM3S6965 microcontroller is factory programmed with a quickstart demo program. The
quickstart program resides in the LM3S6965 on-chip Flash memory and runs each time power is
applied, unless the quickstart has been replaced with a user program.
Ethernet
A key feature of the LM3S6965 microcontroller is its fully integrated Ethernet controller. Only a
RJ45 jack with integrated magnetics and a few passive components are needed to complete the
10/100baseT interface. The RJ45 jack incorporates LEDs that indicate traffic and link status.
These are automatically managed by on-chip microcontroller hardware. Alternatively, the LEDs
can be software controlled by configuring those pins as general-purpose outputs.
The LM3S6965 supports automatic MDI/MDI-X so the EVB can connect directly to a network or to
another Ethernet device without requiring a cross-over cable.
Clocking
The LM3S6965 microcontroller has four on-chip oscillators, three are implemented on the EVB. A
8.0-MHz crystal completes the LM3S6965’s main internal clock circuit. An internal PLL, configured
in software, multiples this clock to 50-MHz for core and peripheral timing.
A small, 25-MHz crystal is used by the LM3S6965 microcontroller for Ethernet physical layer
timing and is independent of the main oscillator.
Power Supplies
The LM3S6965 is powered from a +3.3-V supply. A low drop-out (LDO) regulator regulates +5-V
power from the USB cable to +3.3-V. +3.3-V power is available for powering external circuits.
A +15-V rail is available when the OLED display is active. The speaker and OLED display
boost-converter operate directly from the +5-V rail.
Debugging
Stellaris microcontrollers support programming and debugging using either JTAG or SWD. JTAG
uses the signals TCK, TMS, TDI, and TDO. SWD requires fewer signals (SWCLK, SWDIO, and,
optionally, SWO, for trace). The debugger determines which debug protocol is used.
Debug In Considerations
Debug Mode 3 supports evaluation board debugging using an external debug interface. Mode 3 is
automatically selected when a device such as a Segger J-Link or Keil ULINK is connected.
Boards marked Revision D or later automatically configure pin 1 to be a 3.3-V reference, if an
external debugger is connected. To determine the revision of your board, locate the product
number on the bottom of the board; for example, EK-LM3S6965-D. The last character of the
product number identifies the board revision.
A configuration or board-level change may be necessary when using an external debug interface
with revisions A through C of this evaluation board. Because the evaluation board supports both
debug out and debug in modes, pin 1 of the 20-pin JTAG/SWD header is, by default, not
connected to +3.3 V. Consequently, devices requiring a voltage on pin 1 to power their line buffers
may not work.
[attachment=30324]
The Stellaris® LM3S6965 Evaluation Board is a compact and versatile evaluation platform for the
Stellaris LM3S6965 ARM® Cortex™-M3-based microcontroller. The evaluation kit uses the
LM3S6965 microcontroller’s fully integrated 10/100 Ethernet controller to demonstrate an
embedded web server.
You can use the board either as an evaluation platform or as a low-cost in-circuit debug interface
(ICDI). In debug interface mode, the on-board microcontroller is bypassed, allowing programming
or debugging of an external target. The kit is also compatible with high-performance external JTAG
debuggers.
This evaluation kit enables quick evaluation, prototype development, and creation of applicationspecific
designs for Ethernet networks. The kit also includes extensive source-code examples,
allowing you to start building C code applications quickly.
Hardware Description
In addition to a microcontroller, the Stellaris LM3S6965 evaluation board includes a range of useful
peripherals and an integrated ICDI. This chapter describes how these peripherals operate and
interface to the MCU.
LM3S6965 Microcontroller
Device Overview
The heart of the EVB is a Stellaris LM3S6965 ARM Cortex-M3-based microcontroller. The
LM3S6965 offers 256 KB Flash memory, 50-MHz operation, an Ethernet controller, and a wide
range of peripherals. Refer to the LM3S6965 data sheet (order number DS-LM3S6965) for
complete device details.
The LM3S6965 microcontroller is factory programmed with a quickstart demo program. The
quickstart program resides in the LM3S6965 on-chip Flash memory and runs each time power is
applied, unless the quickstart has been replaced with a user program.
Ethernet
A key feature of the LM3S6965 microcontroller is its fully integrated Ethernet controller. Only a
RJ45 jack with integrated magnetics and a few passive components are needed to complete the
10/100baseT interface. The RJ45 jack incorporates LEDs that indicate traffic and link status.
These are automatically managed by on-chip microcontroller hardware. Alternatively, the LEDs
can be software controlled by configuring those pins as general-purpose outputs.
The LM3S6965 supports automatic MDI/MDI-X so the EVB can connect directly to a network or to
another Ethernet device without requiring a cross-over cable.
Clocking
The LM3S6965 microcontroller has four on-chip oscillators, three are implemented on the EVB. A
8.0-MHz crystal completes the LM3S6965’s main internal clock circuit. An internal PLL, configured
in software, multiples this clock to 50-MHz for core and peripheral timing.
A small, 25-MHz crystal is used by the LM3S6965 microcontroller for Ethernet physical layer
timing and is independent of the main oscillator.
Power Supplies
The LM3S6965 is powered from a +3.3-V supply. A low drop-out (LDO) regulator regulates +5-V
power from the USB cable to +3.3-V. +3.3-V power is available for powering external circuits.
A +15-V rail is available when the OLED display is active. The speaker and OLED display
boost-converter operate directly from the +5-V rail.
Debugging
Stellaris microcontrollers support programming and debugging using either JTAG or SWD. JTAG
uses the signals TCK, TMS, TDI, and TDO. SWD requires fewer signals (SWCLK, SWDIO, and,
optionally, SWO, for trace). The debugger determines which debug protocol is used.
Debug In Considerations
Debug Mode 3 supports evaluation board debugging using an external debug interface. Mode 3 is
automatically selected when a device such as a Segger J-Link or Keil ULINK is connected.
Boards marked Revision D or later automatically configure pin 1 to be a 3.3-V reference, if an
external debugger is connected. To determine the revision of your board, locate the product
number on the bottom of the board; for example, EK-LM3S6965-D. The last character of the
product number identifies the board revision.
A configuration or board-level change may be necessary when using an external debug interface
with revisions A through C of this evaluation board. Because the evaluation board supports both
debug out and debug in modes, pin 1 of the 20-pin JTAG/SWD header is, by default, not
connected to +3.3 V. Consequently, devices requiring a voltage on pin 1 to power their line buffers
may not work.